Display screen or portion thereof with a graphical user interface for a gaming app



The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.

The FIGURE is a front view of a display screen or portion thereof with a graphical user interface for a gaming app.

The broken lines illustrate the display screen or portion thereof and form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with a graphical user interface for a gaming app, as shown and described. 